Speaker parameter refers to using a dedicated speaker test system to test out the speakers of various performance parameters of specific values. Its usual parameters include:. Z, Fo, η0, SPL, Qts, Qms, Qes, Vas, Mms, Cms, Sd, BL, Xmax, Gap gauss or less are several parameters which its physical meaning.
Z: is the impedance value of the loudspeaker, comprising: rated inductance and DC resistance. (Unit: ohm / ohm), usually refers to the nominal impedance.
Speakers rated impedance Z: Impedance is a great value behind the curve minimum impedance modulus value, which corresponds to point B in Figure 1 impedance value.
It is calculated on the basis of electric power speaker.
DC resistance DCR: refers to the voice coil stationary situation, through a DC signal, and the test impedance value. We usually refer to 4 ohms or 8 ohms nominal impedance means. (ACR AC impedance: resistance measured under dynamic voice coil out)
Fo (lowest resonance frequency) is the speaker impedance curve at a frequency corresponding to a maximum value.
Unit: Hertz (Hz) speaker impedance graph is the speaker under normal operating conditions, with constant-current method or constant voltage method measured speaker impedance modulus versus frequency curve.
η0 (speaker efficiency): refers to the speaker output acoustic power and input power ratio.
SPL (sound pressure level): refers to the speaker at the time with the rated impedance voltage electric power 1W. In the reference axis and the speaker on the point of 1m apart.
Unit: decibels (dB) generated pressure.
Qts: The total value because of the quality of the speakers.
Qms: speaker mechanical quality factor values.
Qes: electrical quality factor values speakers.
Vas (trumpet effective volume): it refers to the volume of air enclosed in a rigid container along with the sound-acoustic speaker unit equal of.
Mms (vibrating mass): refers to the total mass of the vibrating speakers involved in the various parts of the movement, including the paper part of the drum, voice coil, elastic waves.
Unit: g (gram) and involved in vibration air quality.
Cms (force cis): refers to the degree of speaker vibration system compliant support member. The greater its value, the entire vibration system speakers softer.
Unit: mm / Newton (mm / N)
Sd (vibration area): refers to the speaker during vibration, the effective vibration area of the drum paper / diaphragm. Unit: square meter (m2) ..
BL (magnetic): gap magnetic flux density and effective voice coil wire length of the product. Unit: (T * M). Xmax: voice coil motion during vibration linear travel. Unit: millimeter (mm).
Gap Gauss: gap magnetic flux density values. Unit: Tesla (Tesla).